<!DOCTYPE html>
<html>
<head>
	<title></title>
	<script type="text/javascript">
			
			var s_one = "abcdef"

			// 字符串的长度
			var lenth = s_one.length

			// 字符串的拼接
			var s_two = 120
			var s_three = "1"

			// 类型转换
			var result = parseInt(s_three) + s_two

			// 字符串 转成 数组 list
			var result = s_one.split('')

			// substring 截取字符串
			var result = s_one.substring(2,4)

			console.log(result)

	</script>
</head>
<body>

</body>
</html>